Blog

In the figure, material 1 is glass (n1=1.55)  and material 2 is vegetable oil. What is the refractive index of vegetable oil, if 

A rectangular coil of 100 turns and the dimensions 10 cm by 30 cm is placed in a uniform magnetic field of 0.8 T. The coil rotates such that its orientation with the field changes from 30 degrees to 60 degrees in 0.1 second. What is the magnitude of induced emf in the coil?

Which of the following is characteristic of bone in climateric changes?

A 400-turn solenoid carries a current of 9.0 A. The length of the solenoid is 14 cm. What is the magnetic field inside the solenoid?

A concave mirror of a radius of curvature 40 cm produces an inverted image 1/3rd of the size of an object. Where is the image located from the mirror?    

A concave lens of focal length of 20 cm forms the image of a pencil at a distance of 12 cm from the lens. Where is the pencil located from the lens ( or what is the object distance)?

The speed of light in material B is 1.2 times as large as it is in material A. What is the ratio of the wavelengths,

A lens produces a virtual image that is smaller than the object. Which one of the following is correct?      

A concave mirror produces an inverted image 3 times taller than the object. If the object is placed at 15 cm from the mirror, what is the focal length of the mirror?

A rectangular coil of 50 turns and the dimensions 20 cm by 30 cm is placed in a uniform magnetic field of 1.2 T. The coil rotates such that its orientation with the field changes from 30 degrees to 60 degrees in 0.1 second. What is the magnitude of induced emf in the coil?